"Since my last blog entry I have mostly completed the implementation of the AWT/Java2D port. It is still in need of a lot of testing, but it is stable enough to run a lot of Swing apps out of the box." Pretty cool for Haiku. I wonder what the use is - besides Minecraft - but alas.

Well the developers already answered that.
Harder to make look native.
More bloated.
Not that much easier... just look how far the support has already gotten with fewer abstractions and therefore fewer bugs. Keep in mind the QT port works well but its still not perfect.